Shelving unit



FIG. 1 is a front perspective view of a shelving unit showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a left end elevational view thereof, the opposing right end elevational view being the same thereof. 

The ornamental design for a shelving unit, as shown and described. 